According to court documents, he had intercourse with a golden retriever and another dog on 19 occasions while he stole large amounts of women's and children's underwear and swimwear from various Byron Shire locations.

Sellenthin was not required to appear before Lismore District Court by video link when his case was mentioned on Monday.

Defence barrister Jason Watts told the court the parties were not ready for his client's sentencing hearing to proceed.

The court heard a work-in-progress statement of facts had been agreed by both parties up to its 49th page, far exceeding many documents of its kind.

It's unclear how much longer the final version of that document will be.

"We're looking for an adjournment to finalise some facts," Mr Watts said

"It's a very lengthy and complex matter.

"We still have a way to go."

Judge Julia Baly accepted Sellenthin's sentencing would be lengthy, noting his charges made up "most of the list" before her court on Monday.

Mr Watts asked her to set a date for the sentencing hearing for later in the year.

"We're fairly confident that we will reach an agreement," he said.

The court heard some experts would be required to contribute to the court's considerations at the hearing and Mr Watts noted his client's complex variety of "sexual -philias".

"This is not pedophilia but it's an array of other -philias," he said.

The court heard the sentencing hearing, scheduled for November 1, would take several hours.